loop: Move special partition reread handling in loop_clr_fd()

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commit d57f3374ba upstream.

The call of __blkdev_reread_part() from loop_reread_partition() happens
only when we need to invalidate partitions from loop_release(). Thus
move a detection for this into loop_clr_fd() and simplify
loop_reread_partition().

This makes loop_reread_partition() safe to use without loop_ctl_mutex
because we use only lo->lo_number and lo->lo_file_name in case of error
for reporting purposes (thus possibly reporting outdate information is
not a big deal) and we are safe from 'lo' going away under us by
elevated lo->lo_refcnt.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jan Kara 2018-11-08 14:01:12 +01:00 • committed by Greg Kroah-Hartman

parent af2dfddd00

commit e04b3348a6

1 changed files with 19 additions and 14 deletions

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drivers/block/loop.c

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